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faint, diffuse H a emission from HVCs; probe of UV radiation

A Search for Emission from Ionized Gas on the Outskirts of M31, M33, and the Milky Way Greg Madsen, Joss Bland-Hawthorn (AAO), Matt Haffner, Ron Reynolds (UW). faint, diffuse H a emission from HVCs; probe of UV radiation requires high sensitivity + spectral resolution

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faint, diffuse H a emission from HVCs; probe of UV radiation

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  1. A Search for Emission from Ionized Gas on the Outskirts of M31, M33, and the Milky WayGreg Madsen, Joss Bland-Hawthorn (AAO), Matt Haffner, Ron Reynolds (UW) • faint, diffuse Ha emission from HVCs; probe of UV radiation • requires high sensitivity + spectral resolution • Ha Map of Complex A: distribution, kinematics, ionizing flux

  2. Davies’ Cloud (Davies 1975, de Heij et al 2002) • ≈ 2º away from M31, may be tidal • moving at ≈ -200 km/s wrt M31 • Wright’s Cloud (Wright 1979) • few degrees from M33, offset by ≈ -150 km/s • large size, velocity gradients • M31/M33 ‘bridge’ (Braun & Thilker 2004) • filament at ≈ 3 x 1017 cm-2

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